* {
  padding: 0;
  margin: 0;
}
li {
  list-style: none;
}
input {
  outline: none;
  border: 0;
}
a {
  text-decoration: none;
  color: #333;
}
a:link,
a:visited {
  text-decoration: none;
  /*超链接无下划线*/
}
img {
  border: 0;
  outline: none;
}
.fl {
  float: left;
}
.fr {
  float: right;
}
.clearfix::after {
  content: "";
  display: block;
  clear: both;
}
